Jib-crane



(No Model.)

E. W. NAYLOR. JIB CRANE N0. 491,127. Patented Feb. 7, 1893.-

INVENTOR.

. H 1 w P. H. w, a E D m U I I HH I HH I I HI HI I a mu N o A @W A1. 70.F

WITNESSES.

Urvrrno STATES.

PATENT OFFICE.

ERNEST WV. NAYLOR, OF CLEVELAND, OHIO.

JlB-C RAN E.

SPECIFICATION forming part of Letters Patent No. 491,127, dated February7,1893.

Application filed April 25, 1892. Serial No. 430,575.

To all whom it may concern:

Be it known that I, ERNEST W. NAYLOR, a subject of the Queen of GreatBritain, residing at Cleveland, in the county of Guyahoga and State ofOhio, have invented certain new and useful Improvements in J ib-Cranesand I do hereby declare the following to be a full, clear, and exactdescription of the invention, such as will enable others skilled in theart to which it appertains to make and use the same.

My invention relates to jib cranes which consist of a main jib and asupplemental jib hinged thereto; and my objects are, first, to provide anovel construction and combination of parts by means of which a load maybe lifted from the floor of the room in which the crane is placed andmoved to and deposit-edv through a door in the Wall which supports thecrane and behind its main supporting post; and second, to providecertain novel combinations of mechanism for operating the several partsof the crane.

v I will now proceed to describe the crane shown in the drawings whichembodies the invention, after which the invention will be particularlypointed out in the claims.

In the drawings, Figure 1 is a side elevation of my improved crane, andFig. 2 is a top View of the same.

A represents the main jib, which is pivoted by means of the post B'tothe supporting brackets 19 12' secured to the wall F. This main jibconsists of suitable vertical and horizontal beams and diagonal bracesto make it strong and stiff enough to support its load,

. which normally includes the supplemental jib and the operatingmechanism. To the free end of the main jib is hinged a supplemental jibC which lies wholly outside of the main jib,that is to say,it is eitherplaced above the upper horizontal beams, or below the lower horizontalbeams whereby the main jib does not at any time interfere with the movement of the supplemental jib. The supplemental jib is longer than themain jib whereby its end extends past the post B when the parts are inthe relative position as shown in the drawings. In order to properlysupport the supplemental jib it is provided with a long post a whichpasses through a post D on the main jib, and is stepped at its lower endin a suitable bearing. The posts 0 and D are (No model.)

hollow so that the hoisting cable may pass axially through them. At theouter end of the supplemental jib a sheave c is fixed over which thehoisting cable runs. Asheave dis fixed to the supplemental jib in suchposition that its face on one side of its center is in the axial line ofthe post a. A third sheave a is fixed to the main jib in the axial lineof the post D, and the hoisting cable passes over the sheaves c, d and ato the take-up mechanism which is carried on the main jib.

The supplemental jibv is turned upon its axis by means of a worm wheel Esecured axially to the post 0, and a worm e mounted on the main jib.This worm is driven by a hydraulic motor F. The main jib is turned onits axis by means of a worm wheel G fixed to the bracket 1) concentricwith the post B, and a Worm g carried by the main jib. This worm isdriven by the independent hydraulic motor H. The hoisting cable is takenup and paid out by thehydraulic cylinder L, its ram I, and the sheaves ZZ operating in the usual manner.

The hydraulic pressure and exhaust columns pass toa nest of valves onthe main jib, through pipes M and N which are arranged axially withreference to the post B of the main jib, and are provided with suitablestuffing boxes. The movement of the water to and from the independentmotors F and H and the cylinder L is controlled by the valves on themain jib. T I

By the construction and arrangement of parts shown and described a loadmay be taken from any point on the floor from within a few feet of themain jib post, to any point as far as both j ibs will reach, lifted anddeposited at any other point within said limits or through an opening inthe wall which supports the crane; and all of these movements are underthe control of one man on the main jib.

Having thus described my invention, what I claim as new and desire tosecure by Letters Patent is;-

1. The combination of a main jib pivoted to suitable supports, and asupplemental jib longer than the main jib lying outside of the main jib,and pivoted to its free end, and independent motors carried on the mainjib and adapted to turn said main and supplemental j ibs on theirrespective axes, substantially as set forth.

2. The combination of a pivoted main jib, and a supplemental jib hingedto its free end, with a Worm Wheel. secured axially to the supplementaljib, a Worm mounted on the main jib, and a motor fol-operating saidWorm,substantially as set forth.

3. The combination of a main jib hingcdto suitable supports, a fixedWorm Wheel placed axially With reference to the mast of said jib,

a Worm mounted on said jib and a motor for I

